Steam-boiler.



No. 687,4|3. Patented Nov. 26, 190:. w. w. a. F. u. maven. 7

STEAM BOILER.

(Application filed June @1901.

(No Model.)

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UNITED STATES PATENT OFFICE,

WILLIAM W. TREVOR AND FRANCIS N. TREVOR, OF LOOKPORT,

M NEW YORK.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent N 0. 687,413, dated November 26, 1901.

Application filed Jul et, 1901.

To all whom it'may concern.-

Be it known that we, WILLIAM W. TREVOR and FRANCIS N. Tanvomcitimns of theUnited States,and residents ofLockport,in the county of Niagara and State of New York, have invented new and useful Improvements in Steam-Boilers, of which the following is a specification.

This invention relates more especially to low-pressure boilers which are used mainly for heating buildings by steam or hot water.

The main object of our invention is to provide a large fire-space and large heating-surfaces without complicating the construction or greatly increasing the cost of manufacture; and to that end we associate with an upright boiler, which contains thefire-chamber, a secondary return-flue boiler in such manner that the hot products of combustion pass from the primary boiler through the return-flue boiler and escape from a smoke-box which is arranged between these boilers.

Another object of our invention is to provide the smoke-box between the two boilers with means whereby the hot products of combustion can be made to pass directly from the primary upright boiler to the smoke pipe when a direct draft is required-as, for instance, in starting the fire or for cleaningor can be made to pass through the secondary boiler before reaching the smoke-pipe for fully absorbing the available heat in the gases when the boiler is working normally.

A further object is to extend the fuel-magazine of the boiler downwardly and to surround the lower end of the magazine by a water-space for protecting the lower end of the magazine against excessive heat and for increasing the heating-surface.

In the accompanying drawings, Figure 1 is a vertical sectional view through a boiler embodying the invention. Fig. 2 is a horizontal sectional View substantially on line 2 2, Fig. 1.

Like letters of reference refer to like parts in both figures.

A represents the outer cylindrical shell of the primary upright boiler, B the inner shell, which extends from the lower end of the outer shell to the top of the combustion chamber b, and b the annular water-space between the shells. The latter are secured together at serial no. 63,426. on model.) 4

their lower ends and spaced apart in any usual manner-for instance, by a spacingring a.

c is the fire-dooropening, formed in the front side of the upright boiler in the usual way and surrounded by the usual spacing-frame 13, secured between the shells.

c 'is the fire-door.

cl is the opening for the exit of the smoke and other hot products -of combustion, arranged in the rear side of the upright boiler near the top of the combustion-chamber and surrounded by a spacing-frame d, secured between the shells.

E represents an annular upper head, which is secured in any approved manner to the upper end of the outer-shell A.

F is a depending inner or lower head, which is secured to the upper end of the inner shell B.

G is the fuel-magazine, which is preferably cylindrical and is secured at its upper endin the upper head and at its lower end in the lower head. The latter has substantially the form of an inverted-cone frustum and extends from the upper end of the inner shell B downwardly and inwardly to the lower end of the magazine. This head forms an annular water-space around the lower portion of the magazine, whereby the magazine is protected against the destructive efiect of the heat in the combustion-chamber and also furnishes a very efficient heating-surface of considerable area. This permits of the magazine being extended to a considerable depth into the combustion-chamber without dan ger to the magazine, therebyincreasing the height of the magazine and its storage capacity materially. The magazine by connect ing the heads also adds to the strength and rigidity of the structure. A desirable manner of connecting the magazine to the two heads is by screw-threading the ends of the magazine and screwing the same into internally-screw-threaded flanges e and f on the heads.

h represents the cover of the magazine.

I represents the ash-box, of any suitable construction; 1', the door thereof; J, the grate, and j the fire-pot. The latter may be made of fire-bricks, iron blocks, or the like, resting against the inner face of the inner shell, and

may be supported upon a flange j. The firepot may, however, be omitted in small boilers and the fuel be placed directly against the inner shell.

K represents the secondary boiler, which is a return-flue boiler and arranged in rear of the primary upright boiler, so as to receive the hot gaseous products of combustion from the latter. It represents the horizontal cylindricallshell of this secondary boiler; 70 the end heads or flue-sheets; it the lower direct lines; 70 the upper return-fines; it the smoke-chamber at the rear end of this boiler, audit; the door of this chamber. The secondary boiler is placed at such a height relative to the upright boiler that the water-1e vel,

which is the same in both boilers, stands at the proper height above the flues in the secondary boiler.

m represents awater-circulating pipe connecting-the lower portion of the water-space of the secondary boiler with the water-leg of the primary boiler, and m represents a steam-circulating pipe connecting the steamspaces of both boilers.

Between the primary and secondary boilers there is arranged a smoke-chamber N, which is composed of two compartments N N The compartment N forms a connecting-passage between the smoke-exit d of the primary boiler and the direct flues 70 of the secondary boiler, and-the compartment N forms the exit-passage for the return-fines k of the secondary boiler. This intermediate smokechamber is conveniently formed by a shell of approximately cylindrical form having about the same diameter as the return-flue boiler and is secured to both boilers in anysuitable Way. The two compartments N N are preferably formed by dividing this intermediate smoke-chamber by a diaphragm n, which is preferably arranged horizontally, so that the compartment N is located below and the compartment N above said diaphragm, although different arrangements may be employed, if desired. The diaphragm n is preferably provided with a draft-opening n, which can be opened or closed by a damper m The communication between the compartments N N lower compartment N, the lower direct flues it the rear smoke-chamber 70 the upper return-fines It, and the upper compartment N to the openingn leading to the smoke-pipe, thus utilizing, the secondary boiler for absorbing the available heat in the hot prodnets of combustion which escape from the primary boiler.

O is a door or damper in thebottom of the intermediate smoke-chamber for removing cinders, ashes, &c.

We claim as our invention- The combination of a primary upright boiler, a secondary return-flue boiler, an intermediate smoke-chamber secured to both boilers and provided with a horizontal diaphragm which divides the smoke-chamber into a lower and an upper compartment, a smoke-pipe on said upper compartment, the lower compartment connecting the smokeexit of the primary boiler with the direct flues of the secondary boiler and the upper compartment connecting the return-fines with the smoke-pipe, a direct-draft opening formed in said diaphragm, and adamper controlling said opening, substantially as set forth.

Witness our hands this 4th day of June, 1901.

\VILLIAM W. TREVOR. FRANCIS N. TREVOR.

Witnesses:

M. L. WEBSTER, H. F. OUsHMAN. 

